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Arri Alexa XT Camera

ALEXA-XT1

The ALEXA XT (Xtended Technology) cameras add a number of exceptional features to the ALEXA family: in-camera ARRIRAW up to 120 fps, a Super 35 sensor with Open Gate and 4:3 sensor modes, Lens Data System, integrated CDL capture, anamorphic de-squeeze and high speed licenses, new viewfinder mounting bracket as well as a new, super silent fan. These features will expand on the benefits that have already made ALEXA such an extraordinary success – highest overall digital cinema image quality and lowest overall production cost through reliability, ergonomics and efficient workflows.

• Body weighs 14.5 lbs.
• 14 stops of Latitude
• Alev III Sensor
• Native 800 ASA
• ARRIRAW internal recording to Codex Capture Drives
• ProRes internal recording to SxS cards
• Record 3k, 2k, 1080p
• Record up to 120fps
• Super 35 film look
• Records 2 Channel, uncompressed 24 bit 48KHz audio

ALEXA XT Family Features

Record it all: Open Gate sensor mode
Using the full ALEXA sensor area, Open Gate mode is great for VFX shows, up-sampling to 4K, image repositioning, resizing, rotating or stabilizing. While some use it as their main recording format, others shoot in 16:9 or 4:3 and only certain scenes in Open Gate.

True anamorphic with 4:3 sensor mode
For the most effective use of anamorphic lenses, each ALEXA XT model is equipped with an Open Gate sensor of the same size and shape as a Super 35 mm film frame, a feature only found on ALEXA digital cameras. The 4:3 sensor mode is crucial for delivering the unique and cinematic widescreen look that can trace its origins back to the CinemaScope films of the 1950s. It is a look that has long been appreciated by cinematographers, directors and the viewing public. For convenient viewing of anamorphic images an anamorphic de-squeeze license is included with all ALEXA XT cameras.

In the images below, the sensor area used for shooting with anamorphic lenses is shown. Since an anamorphic lens squeezes the CinemaScope 2.39:1 image by a factor of 2, it needs a sensor area with a 1.195:1 aspect ratio. Film (orange) and the ALEXA sensor (blue) are tall enough to easily accommodate this, as can be seen in the left image. Since film and the ALEXA sensor have almost exactly the same dimensions, they exhibit the same angle of view for anamorphic lenses, which will be welcome news for cinematographers. Cutting the required 1.195:1 aspect ratio out of a 16:9 sensor (right image) results in a significantly smaller sensor area (grey area), which means fewer photosites and a different angle of view than what cinematographers are used to.

Space for VFX markers in 4:3 sensor mode
The 4:3 sensor is also useful for productions shooting with spherical lenses, as it permits the placement of tracking markers above and below the image, a shooting method popular with VFX heavy feature films. Alternatively, the extra room can be used for reframing in post, similar to shooting 4-perforation 35 mm.

Faster, lighter and more affordable ARRIRAW
All ALEXA XT cameras come with the new XR Module (Xtended Recording), a side panel that was co-developed with Codex to replace the previous SxS Module. The XR Module allows in-camera recording of uncompressed and unencrypted ARRIRAW, ALEXA’s highest quality image output, all the way up to 120 fps in full image quality. This not only makes for a smaller, lighter and more affordable camera package, it also simplifies setup and operation while avoiding unnecessary cabling.

ALEXA XT cameras record ARRIRAW onto exceptionally fast and rugged 512 GB XR Capture Drives, including advanced and time-saving features such as capturing the ASC Color Decision Lists (CDL) and a checksum for each frame into metadata. Once removed from the camera, the XR Capture Drive offers a number of different paths into post for every budget and time schedule demand, using the proven Codex workflow.

 

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